Power wrench



FIG. 1 is a top plan view of a power wrench showing our new design;

FIG. 2 is an elevational view;

FIG. 3 is an elevational view looking from the right of FIG. 2, the opposite being a mirror image thereof;

FIG. 4 is an elevational view looking from the right of FIG. 3; and

FIG. 5 is a bottom plan view. 

The ornamental design for a power wrench, as shown and described. 